package com.work.yshop.utils;

import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
 * 图片工具类
 */
public class ImageUtils {

    /**
     * 从Uri获取文件路径
     */
    public static String getPathFromUri(Context context, Uri uri) {
        if (uri == null) return null;
        
        // 判断是否是Android 4.4及以上版本
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, uri)) {
            // ExternalStorageProvider
            if (isExternalStorageDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                
                if ("primary".equalsIgnoreCase(type)) {
                    return Environment.getExternalStorageDirectory() + "/" + split[1];
                }
            }
            // DownloadsProvider
            else if (isDownloadsDocument(uri)) {
                final String id = DocumentsContract.getDocumentId(uri);
                final Uri contentUri = ContentUris.withAppendedId(
                        Uri.parse("content://downloads/public_downloads"), Long.parseLong(id));
                
                return getDataColumn(context, contentUri, null, null);
            }
            // MediaProvider
            else if (isMediaDocument(uri)) {
                final String docId = DocumentsContract.getDocumentId(uri);
                final String[] split = docId.split(":");
                final String type = split[0];
                
                Uri contentUri = null;
                if ("image".equals(type)) {
                    contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
                } else if ("video".equals(type)) {
                    contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
                } else if ("audio".equals(type)) {
                    contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
                }
                
                final String selection = "_id=?";
                final String[] selectionArgs = new String[]{split[1]};
                
                return getDataColumn(context, contentUri, selection, selectionArgs);
            }
        }
        // MediaStore (一般形式)
        else if ("content".equalsIgnoreCase(uri.getScheme())) {
            // 从联系人返回
            if (isGooglePhotosUri(uri)) {
                return uri.getLastPathSegment();
            }
            
            return getDataColumn(context, uri, null, null);
        }
        // 文件
        else if ("file".equalsIgnoreCase(uri.getScheme())) {
            return uri.getPath();
        }
        
        return null;
    }
    
    /**
     * 获取数据列的值
     *
     * @param context       上下文
     * @param uri           URI
     * @param selection     查询条件
     * @param selectionArgs 查询条件参数
     * @return 文件路径
     */
    private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        Cursor cursor = null;
        final String column = "_data";
        final String[] projection = {column};
        
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                final int columnIndex = cursor.getColumnIndexOrThrow(column);
                return cursor.getString(columnIndex);
            }
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return null;
    }
    
    /**
     * 判断是否是ExternalStorage文档
     */
    private static boolean isExternalStorageDocument(Uri uri) {
        return "com.android.externalstorage.documents".equals(uri.getAuthority());
    }
    
    /**
     * 判断是否是DownloadsProvider文档
     */
    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }
    
    /**
     * 判断是否是Media文档
     */
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
    
    /**
     * 判断是否是Google相册图片
     */
    private static boolean isGooglePhotosUri(Uri uri) {
        return "com.google.android.apps.photos.content".equals(uri.getAuthority());
    }
} 